Improvement in ore-stamps



w. a. mam 1. s. JONES.

ilrestam p Ptented Sept.'28, 1875.

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I m vuj v k x/ INVENTURS:

ATTEST:

, N. PEI'ERS. PHOT'O-UTNOGRAPNER, WASHING UNITED STATES ASSIGNORS OFONE-THIRD SAME PLACE.

PATENT Orrroe.

-WILLIAM G. FERGUSON AND JOHN S. JONES, OF ST. LOUIS, MISSOURI, THEIRRIGHT TO JOHN L. FERGUSON, OF

IMPROVEMENT lN ORE-STAMPS.

Specification forming part of Letters Patent No. 168,245, datedSeptember 28, 1875; application filed April 23, 1875.

To all whom it may concern Be it known that we, WILLIAM G. FERGU- sonand JOHN S. JONES, both of St. Louis, St. Louis county, State ofMissouri, have invented certain new and useful Improvements inOre-Stamping Mills, of which the following is a specification: g

The invention relates to a stamping-mill belonging to that class inwhich, as the stamp is lifted by a cam, a spring is compressed,

whose reaction imparts a rapid downstroke to the stamp.

The present improvement consists in the combination, with said stamp, oftwo or more axis, (so as to give increased resistance to the rotation ofthe cam-shaft,) the lifting action of the cam is proportionately slowerand i more powerful, so as to overcome the increasing resistance of thespring and frictioualresistance, and so conduce to the regular runningof the machinery.

In the accompanying drawings, Figure 1 is a perspective view of themill. -Fig. 2 is a detail View of the cam. e

A is the supporting-frame of the mill, that may be of any suitableconstruction. B is the driving-shaft, carrying the cam O, that lifts thestamp D by means' of a collar upon its shaft E. F F are spiral springssurrounding the stamp-shaft, and arranged, the former between the collarG and the cross-bar a,

and the latter between the cam-collar H and the cross-bar a of theframe. The cam O is formed with a pitch gradually decreasing from itsstarting-point c to outer point 0, so as to raise the stamp withgradually-decreasing speed as it ascends, and so that the increasingresistance of the spring or springs to further compression will be metbya slower,

and, consequently, more powerful, lifting movement, and thus theresistance to the driving-motion be equalized during the whole ascent ofthe stamp. In this way less power is required to drive the mill thanwhere the usual form of cam is used, where no such device is used-tocompensate for the increasing resistance of the springs as the stampascends. In addition to this increasing tension of the springs, as thecam turns, the part of its face in contact with the collar His fartherfrom the axis, and, consequently, the frictional resistance increases,and the described form of cam compensates for this also. The stamp-shaftE is free to turn in its bearings I I, so that the cam, while liftingit, will impart to it 'a rotary motion bythe friction of the cam uponthe collar H.

It is evident that three or more stamps can be arranged side by side inone frame, and the lifting-cams be so arranged on a common shaft thatthe blows of the cams shall follow each other in regular order. v

The two springs F F have advantage over a single spring having a likeplay and a power equal to the aggregate power of the two, be-

cause the two springs hold the shaft more steadily in its bearings thanwhere the pressure is only on one point. In addition to this, in caseone. of the two springs should break at any time, the stamp may be runwith the remaining spring until the mill is stopped, and it will not benecessary to stop the whole battery for'the repair of a single spring,as would be the case where a single spring only is used, and that springis broken.

We claim The combination, in a stamp-mill, of the stamp D, with shaft E,spring or springs F, with lifting-cam O, having a decreasing pitch fromits point a to point 0, substantially as and for the purpose set forth.

WILLIAM C. FERGUSON. JOHN S. JONES.

